/**
* An instantiation of docIteratorHasMatch that is true if the query has a document that matches
* all query arguments; some subclasses may choose to use this implementation.
*
* @param r The retrieval model that determines what is a match
* @return True if the query matches, otherwise false.
*/
protected boolean docIteratorHasMatchAll(RetrievalModel r) {
boolean matchFound = false;
// Keep trying until a match is found or no match is possible.
while (!matchFound) {
// Get the docid of the first query argument.
Qry q_0 = this.args.get(0);
if (!q_0.docIteratorHasMatch(r)) {
return false;
}
int docid_0 = q_0.docIteratorGetMatch();
// Other query arguments must match the docid of the first query
// argument.
matchFound = true;
for (int i = 1; i < this.args.size(); i++) {
Qry q_i = this.args.get(i);
q_i.docIteratorAdvanceTo(docid_0);
if (!q_i.docIteratorHasMatch(r)) { // If any argument is exhausted
return false; // there are no more matches.
}
int docid_i = q_i.docIteratorGetMatch();
if (docid_0 != docid_i) { // docid_0 can't match. Try again.
q_0.docIteratorAdvanceTo(docid_i);
matchFound = false;
break;
}
}
if (matchFound) {
docIteratorSetMatchCache(docid_0);
}
}
return true;
}
/**
* Advance the internal document iterator to the specified document, or beyond if it doesn't.
*
* @param docid An internal document id.
*/
public void docIteratorAdvanceTo(int docid) {
for (Qry q_i : this.args) {
q_i.docIteratorAdvanceTo(docid);
}
this.docIteratorClearMatchCache();
}